Damper for sound boxes of phonographs



Feb. 6,1923. 1,444,196.

J. M. LOGAN.

DAM PER FOR SOUND BOXES 0F PHONOGRAPHS. FILED MAR 20. 1922.

INVENTOR has for its object to provide an improved carrier are transmitted to the diaphragm of Patented Feb; 6, i923.

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mmnsmonnon LOGAN, or nnw niivniv connnorrcur.

DAMBER non sounn Bonus on rgfnonosanrns.

Application filed marche 1922. Serial no. 54 ,258.

To all whom it may concern; 1

Bel it known that JAMES' MONROE LOGAN, a citizen of. ,the United States, and resident of New aven, in .the county of New Haven and State of Connecticut, has invented certain new and useful Improvements in Dampers for Sound Boxes of Phonograph's,

of Which the following is a specification. v The present invention relates to phonographs or sound-reproducing machines and vibration dampening attachment for the sound box of such machines whereby the sound reproduced therewith is modified so as to be purer or more natural in tone.

The improved attachment may be applied to a sound-box of any ordinary type having a vibrating carrier or holder for the needle or stylus and a vibratory arm through.

'which vibrations imparted to the stylus and the sound box;

It will be understood in the transmission of the vibrations, to reproduce the original sound waves, counter or additional and excessive vibrations are created which have a tendency to 'cause harshness or grating in the reproduced sound; and by means of the improvedattachment, all harshness and grating is eliminated.

Previously to this invention it has been proposed to provide a device built up with different parts in the form of a pair of jaws which are opened and closed by a spring so as to eifect clamping of the device on the vibratory. arm of the sound-box in different struction thereof and furthermore a positions along the length thereof to produce a variable effect. The attachment or device forming the subject of this invention is designed'to be an improvement of such previously known 1 means, as regards conore perfect result is attained with the improved attachment.

In carrying out the invention the improved attachment or device is composed ofone piece or block of soft rubber 'or other suitable material having substantially-the same.physi cal property as soft rubber. The device is of a ta ering shape having a slit in the small end and oppositely disposed notches in thelarge end which permit opening of said slit to engage the vibratory arm of the sound-box, when pressure is imparted to the sides of the device to open the slit.

device by reason-of the elasticity of the materlal of dvhich it is composed causes selfclosing of the slit and maintains a tight grip so, that the device will be retained in its various set positions.

The improved attachment will be hereinafter described with reference to the ,ac-

companying drawings wherein- Figure 1, is aperspective view of the improved attachment. V

Figure 2 is a bottom plan view of an ordinary sound box with the improved attachme'nt shown in one of its positions ,on. the vibratoryarm of the sound box, and

Figure 3 is a side elevation of the sound .boxwith the attachment mounted thereon.

Referring to the drawings, the sound box 1 may be of any suitable type having a diaphragm 2, a vibrating carrier or'holder 3 like shaped solid. block of rubber having one corner cut oil to form a straight edge 9, having the slit 10 therein, and in the baseor bottom edge 11 of the block 8 notches 12 are cut. e .The improved device is applied or adjusted with facility for the base is only pressed so aslto close the notches 12. and open theslitlO. When pressure is released the device will by it's own elasticity, return to its original shape in which the notches are opened and'the slit closed-tightly so as to hold the device in the determined posi- .tion on the needle or vibratory arm 7. The

device may thus be moved and held any- H where alongthe length ofthe arm-7. The efi'ect of the device is to cause dampening of the vibrations and being composed entirely of a non-metallic substance, of a determinable size, shape and weight, an effective and I determinate dampening action is produced and which effect is varied according to the position of the device relatively to the needle i as I I I H I I I l or stylus carrier viz: when the device 1s [close to the carrler the dampening actionls less than .When the device is further away from the carrier. I

'-It will be understood the improved devife device has what may be termed a floating movement with the vibratory arm thereby to better control the undesired vibrationsof said arm.

I claim A device of the class described composed of a solid block of elastic material of a tapering shape, a slit,'and a pair of notches formedmespectivcly in the small and large ends of said block'whereby attachment of the device may be efi'ectedbyn applying pressure to thesides thereof.

Signed in New Haven, in the county of New Haven, and State of Connecticut, this 98th day of August, A. D. 1922.

JAMES ONR E LGGANI 

